Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d679d86ca26bcd…

MALICIOUS

PDF

109.2 KB Created: 2021-06-27 01:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e79f2ba538c30780a9c37ec4afe96f46 SHA-1: 2c4f7119589376b5ec5be81fb089664be01afc7b SHA-256: 22d679d86ca26bcd546132020167a0b6caf513187879ed9381c2400bac95fbb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=tec+online+exam+questions+and+answers
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b4336a04---51184108996.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7da09ae7c37267965cc0e25db2f29f39/37344321019.pdf
    • http://viajesalaos.com/webroot/img/files/ruromozufarakumo.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3d6acb17---71378342157.pdf
    • http://kimhoatra.com/upload/fckimagesfile/dijuxaxazog.pdf
    • http://wumag.pl/userfiles/file/88279147970.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd85107121---bikajuwunenavafazuzaloko.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6151097629b265cea2bc29f45411cbc4/miseletufejukifoluzibe.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/73dc6eb390f07a72781600b3171e55b7/kerisumawoxof.pdf
    • http://sciattella.net/images/file/xawunemozoxagomides.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/fekadokejinefo.pdf
    • https://brianhigbielaw.com/UserFiles/file/35291071342.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sn0inqp1p9d9cpsaeussu7qslk/tavopipiravesikifuvadetor.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3b0bf65f236d4097fa0adc88ea44b22e/70543933856.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160806624980a0---nudoxunedozifamokurol.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b23b3dae---13139873088.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f7032db4550ce6cad02652898a8ff69e/mujunevuso.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a959dda6---54795738735.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/ludarik.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca0131670---zomizijiluzanigonas.pdf
    • https://faresaldabbous.com/uploads/files/mitan.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i35o5h3qlp4h2ajt0uubp9u4u5/najaxudalixujidox.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/39b304d1ed10230aa9be07a0f876a350/29345419521.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dce.bin
0fea422a483d7b0c937c0ef95f575c5001ad717d7210d3a5cb52a4f58778b7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 17944 bytes
font_01_sfnt_off00015cab.bin
eb05db526c791534d33d83d4f1053ed70331d32fc04f1735bcda979b96420413
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAB 10928 bytes
font_02_sfnt_off000175db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x175DB 16792 bytes
font_03_sfnt_off00018dec.bin
281854f4ce786ae168803b27969eff9b9bfb749d96788892a8136b6b721efd29
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEC 16952 bytes